Mohammed in AD 632 led to the creation of new Islamic states in most of the Byzantine Empire, North Africa, and Spain. These common processes rocked Europe, and in their wake a particular type of society, commonly referred to as feudal, emerged. Feudal society was decentralized because strong central states had atrophied, even if some rulers such as Charlemagne attempted to reconstruct them.
Feudal institutions, which relied on unfree, coerced labor( the serfs), were obviously extractive, and they formed the basis for a long period of extractive and slow growth in Europe during the Middle Ages. But they also were consequential for later developments. For instance, during the reduction of the rural population to the status of serfs, slavery disappeared from Europe. At a time when it was possible for elites to reduce the entire rural population to serfdom, it did not seem necessary to have a separate class of slaves as every previous society had had. Feudalism also created a power vacuum in which independent cities specializing in production and trade could flourish. But when the balance of power changed after the Black Death, and serfdom began to crumble in Western Europe, the stage was set for a much more pluralistic society without the presence of any slaves.
The critical junctures that gave rise to feudal society were distinct, but they were not completely restricted to Europe. A relevant comparison is with the modern African country of Ethiopia, which developed from the Kingdom of Aksum, founded in the north of the country around 400 BC. Aksum was a relatively developed kingdom for its time and engaged in international trade with India, Arabia, Greece, and the Roman Empire. It was in many ways comparable to the Eastern Roman Empire in this period. It used money, built monumental public buildings and roads, and had very similar technology, for example, in agriculture and shipping. There are also interesting ideological parallels between Aksum and Rome. In AD 312, the Roman emperor Constantine converted to Christianity, as did King Ezana of Aksum about the same time. Map 12 shows the location of the historical state of Aksum in modern-day Ethiopia and Eritrea, with outposts across the Red Sea in Saudi Arabia and Yemen.
Just as Rome declined, so did Aksum, and its historical